The strong earthquake was felt widely across the region shortly after 9 p.m. PT. The USGS said the epicenter was 1 mile from Brea, located about 20 miles southeast of downtown Los Angeles, and 3 miles from Rowland Heights and Fullerton.

Southern California Edison reported power outages to nearly 2,000 customers after the quake.

The quake triggered a rockslide that closed Carbon Canyon Road in northern Orange County near the center of the quake, the California Highway Patrol and Brea police reported. The rockslide caused a car to overturn, and the people inside the car sustained minor injuries.

Up to 50 people have been displaced due to housing damage, the Orange County Register reported.

Seven water leaks, including a broken water main in Fullerton, not far from the center of the quake, were attributed to the quake, the Register reported. Other minor structural damage was reported in Brea, La Habra and Buena Park.

The quake was felt as far south as San Diego and as far north as Ventura County, according to citizen responses collected online by the U.S. Geological Survey.

More than two dozen aftershocks rattled the region. The magnitude-5.1 quake was preceded by a 3.6 quake an hour earlier.

Police and fire officials said they were looking for any damage. Several people who live in the area near the quake posted pictures on social media showing broken glasses and dishes that tumbled from shelves or cabinets.

Tom Connolly, a Boeing employee who lives in La Mirada, the next town over from La Habra, said the magnitude-5.1 quake lasted about 30 seconds.

"We felt a really good jolt. It was a long rumble and it just didn't feel like it would end," he told the Associated Press by phone. "Right in the beginning it shook really hard, so it was a little unnerving. People got quiet and started bracing themselves by holding on to each other. It was a little scary."

Hall of Fame announcer Vin Scully was on the air calling the Angels-Dodgers exhibition game in the sixth inning at Dodger Stadium.

"A little tremor here in the ballpark. I'm not sure if the folks felt it, but we certainly felt it here in press box row," Scully said. "A tremor and only that, thank goodness."

Los Angeles Department of Public Works said it was sending crews to check dams, bridges and other infrastructure for damage.

Callers to KNX-AM reported seeing a brick wall collapse, water sloshing in a swimming pool, and wires and trees swaying back and forth.

"Tonight's earthquake is the second in two weeks and reminds us to be prepared," said L.A. Mayor Garcetti. "The Los Angeles Police and Fire Departments have conducted an assessment and report no damage in the city."

U.S. Geological Survey seismologist Lucy Jones at CalTech in Pasadena told the Los Angeles Times that the 5.1 quake has a 5% chance of being a foreshock of an even larger quake. "There could be even a larger earthquake in the next few hours or the next few days," she said.

"It's a place where we've had a lot of earthquakes in the past," she said.

The 5.9 Whittier Narrows quake killed eight people and caused $360 million in damage.

At Disneyland in Anaheim, rides were stopped as a precaution, the L.A. Timesreported.

Friday's quake hit a week after a predawn magnitude-4.4 quake centered in the San Fernando Valley rattled a swath of Southern California. That jolt shook buildings and rattled nerves, but did not cause significant damage.

Southern California has not experienced a damaging earthquake since the 1994 magnitude-6.7 Northridge quake killed several dozen people and caused $25 billion in damage.